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Код

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Документ без названия</title>
<script type="text/javascript">
    var X;
    function setXValue(value) {
        X = value;
        // или
        // X = parseInt(value);
        alert(X);
    }
</script>
</head>

<body>
<form action="#" id="_form">
    <input type="radio" value="1" name="radio1" id="radio1" onclick="setXValue(this.value);" /><label for="radio1">1</label><br />
    <input type="text" /><br />
    <input type="text" /><br />
    <input type="text" /><br />
    <input type="text" /><br />
    <input type="text" /><br />
    <input type="text" /><br />
    <input type="button" value="next" onclick="focusNext();" />
</form>
<script type="text/javascript">
    var focusedElem = null;
    function focusChanged(evnt) {
        var ev = (evnt) ? evnt : event;
        var sender = (ev.target) ? ev.target : ev.srcElement;
        focusedElem = sender;
    }
    var __form = document.getElementById("_form");
    for (var i = 0; i < __form.elements.length; i++) {
        if (__form.elements[i].type != "text") continue;
        if (__form.elements[i].addEventListener) {
            __form.elements[i].addEventListener("focus", focusChanged, false);
        } else {
            __form.elements[i].attachEvent("onfocus", focusChanged, false);
        }
    }
    function focusNext() {
        if (focusedElem == null) {
            focusedElem = __form.elements[0];
            focusedElem.focus();
        } else {
            focusedElem = focusedElem.nextSibling;
            while (focusedElem != null) {
                if (focusedElem.type != "text") {
                    focusedElem = focusedElem.nextSibling;
                } else {
                    focusedElem.focus();
                    return true;
                }
            }
            focusedElem = __form.elements[0];
            focusedElem.focus();
        }
    }
</script>
</body>
</html>